EP0706894A2 - Système de prélèvement et séparation des feuilles pour appareil fac-similé et machine à copier - Google Patents

Système de prélèvement et séparation des feuilles pour appareil fac-similé et machine à copier Download PDF

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Publication number
EP0706894A2
EP0706894A2 EP95109832A EP95109832A EP0706894A2 EP 0706894 A2 EP0706894 A2 EP 0706894A2 EP 95109832 A EP95109832 A EP 95109832A EP 95109832 A EP95109832 A EP 95109832A EP 0706894 A2 EP0706894 A2 EP 0706894A2
Authority
EP
European Patent Office
Prior art keywords
paper
roller
sheets
stack
stripper roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95109832A
Other languages
German (de)
English (en)
Other versions
EP0706894A3 (fr
EP0706894B1 (fr
Inventor
Morad M. Samii
Chuong C. Ta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HP Inc
Original Assignee
Hewlett Packard Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0706894A2 publication Critical patent/EP0706894A2/fr
Publication of EP0706894A3 publication Critical patent/EP0706894A3/fr
Application granted granted Critical
Publication of EP0706894B1 publication Critical patent/EP0706894B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/103—Sheet holders, retainers, movable guides, or stationary guides for the sheet feeding section

Definitions

  • This invention relates to feed mechanisms for a facsimile machine, copy machine, printer, or other machine which requires paper to be advanced one sheet at a time.
  • a typical facsimile machine or copy machine can receive a stack of paper sheets for reading or copying and automatically feed one sheet at a time from the stack for further processing by the machine.
  • One well known paper separation technique uses a single paper-feed roller made of rubber or other high-friction material.
  • One or more paper-feed springs (usually a leaf spring) opposes the roller. When a stack of paper is properly placed into a paper tray, the edge of the stack of paper is wedged between the high friction roller and the paper-feed springs.
  • the roller begins turning, while the paper-feed springs press the stack of paper against the roller, the bottommost sheets will be forwarded by action of the roller while the top sheets will be generally restrained by the angle of the paper-feed springs.
  • two or more sheets of paper are forwarded beyond the paper-feed springs and must be separated from one another.
  • a separator pad formed of rubber is located downstream from the paper-feed springs.
  • a separator spring biases the separator pad against the paper-feed roller or against a downstream roller.
  • a downward force of the separator pad against the top sheets now frictionally grips these top sheets.
  • the greater frictional force provided by the paper-feed roller against the bottom sheet now causes only the bottom sheet to be forwarded beyond the separation pad for further processing.
  • the high-friction paper-feed rollers used in these types of devices are cylindrical with no perceptible asymmetry so as to provide a relatively constant forwarding force to the paper sheets.
  • An improved paper separator system is described for use in any machine in which the user inserts a stack of paper in the machine and the machine is required to feed one sheet at a time for further processing.
  • an asymmetrical feed roller (or stripper roller) is used instead of a symmetrical, cylindrical paper-feed roller. Eccentric portions of the feed roller are located at both ends of the roller, and the middle portion of the roller is cylindrical.
  • Paper-feed springs oppose the eccentric portions of the feed roller, while a centrally located separator pad opposes the cylindrical middle portion of the feed roller.
  • the extended radius at the apogee of the eccentric portions allows the eccentric portions to effectively reach out and grab the bottommost sheet even if the stack of paper were only initially lightly contacting the roller. This action compensates for the varying degrees of insertion force by the various users when inserting the paper stack into the machine.
  • the eccentric portions of the feed roller also provide surges in the frictional force urging the bottommost sheets toward the separator pad. This surge in force acts to spread out (or pre-separate) the paper in the stack so the paper can be more easily separated by the separator pad.
  • This paper-feed roller embodiment can easily be formed to replace paper-feed rollers on existing machines. A simple and inexpensive method for forming the asymmetrical paper-feed roller is also described.
  • Fig. 1 is a top perspective view of a facsimile machine incorporating the preferred stripper roller assembly.
  • Fig. 2 is a back perspective view of the machine of Fig. 1 with its cover opened.
  • Fig. 3 is the preferred embodiment of the stripper roller assembly.
  • Fig. 4 is a front elevational view of the stripper roller of Fig. 3.
  • Fig. 5 is a perspective view of the preferred embodiment spring structure.
  • Fig. 6 is a magnified exploded view of the spring structure and separation pad assembly shown in Fig. 2.
  • Figs. 7 and 8 are side views of the stripper roller assembly interacting with the spring assembly of Fig. 6.
  • Fig. 9 illustrates the rotational angle versus downward force provided by the paper-feed springs on the kicker portions of the stripper roller.
  • Figs. 10 and 11 are side views of the stripper roller assembly illustrating the dynamic action of the stripper roller while pulling sheets of paper from a stack of paper into the machine for separating a bottom sheet of paper from the stack of papers.
  • Fig. 12 illustrates the shaft upon which the stripper roller is mounted.
  • Fig. 13 illustrates the grinding process to form the stripper roller.
  • Fig. 14 illustrates the cutting process to separate kicker portions from the middle portion of the stripper roller.
  • Fig. 15 illustrates a method for forming the eccentricity in the kicker portions.
  • Fig. 1 is a front perspective view of a facsimile machine 10 incorporating the preferred embodiment paper separator mechanism.
  • Facsimile machine 10 contains a paper tray 12 which is downward directed so that a paper stack 14 placed into tray 12 is urged toward the receiving portion of machine 10 by gravity. The paper stack 14 enters a slot in the back of machine 10.
  • a paper separation mechanism within machine 10 pulls one sheet of paper at a time from the bottom of the stack 14 so that printing on the sheet may be read and subsequently transmitted by the facsimile machine 10 in a well known manner.
  • the sheet may also be copied by machine 10.
  • machine 10 is a printer which feeds in blank sheets of paper for printing thereon. The individual sheets of paper are then outputted through exit slot 16.
  • a printing mechanism (not shown) is also provided in the complete machine 10 for printing received facsimile transmissions.
  • the printing mechanism which may be an inkjet or laser printer, can also be used when machine 10 is used as a copier or printer.
  • Fig. 2 is a back perspective view of the facsimile machine 10 with its hinged top portion 17 lifted up to reveal the paper separation and paper transport mechanisms. Paper feed tray 12 has been removed in Fig. 2 for simplicity.
  • top portion 17 is in its closed position, shown in Fig. 1, and paper stack 14 is placed in paper tray 12, the front edge of the stack extending over shelf 18 abuts against a rubber stripper roller 20, and paper-feed springs 22 and 24 provide a downward force on paper stack 14.
  • a rubber separator pad 26, biased downward by a separator spring 27 (shown in Fig. 5 but obscured in Fig. 2), effectively blocks all sheets but the bottom sheet so that only the bottom sheet directly contacted by the rubber stripper roller 20 is forwarded past separator pad 26.
  • the average forwarding speed of stripper roller 20 is about 12 mm/sec.
  • a downstream, rubber main feed roller 30 is rotated so as to have a faster paper forwarding speed (e.g., 26 mm/sec.) than stripper roller 20.
  • a faster paper forwarding speed e.g., 26 mm/sec.
  • stripper roller 20 is driven via a slip clutch, which allows stripper roller 20 to rotate at the increased forwarding speed of main feed roller 30 when a single sheet of paper simultaneously contacts both rollers 20 and 30.
  • Main feed roller 30 forwards the paper over a window 34, below which resides the necessary optical detection electronics for detecting the printing on the bottom sheet.
  • Such optical electronics can be conventional and will not be described in detail herein. If machine 10 were solely a printer, window 34 and the optical electronics may be replaced by a printing mechanism.
  • a kick-out roller 36 in conjunction with a passive opposing roller 38, has a 2% faster forwarding speed than main feed roller 30 to ensure that there is no slack in the paper between rollers 30 and 36.
  • the pulling force of main feed roller 30 is approximately 3 pounds, while the pulling force of kick-out roller 36 is approximately 1.5 pounds, so the speed of the paper is controlled by main feed roller 30 rather than kick-out roller 36.
  • a single stepper motor drives each of the rollers 20, 30, and 36, and conventional gear mechanisms and slip clutch mechanisms are used for driving rollers 20, 30, and 36 at the required rotational speeds and forces.
  • the below-described stripper roller 20 and opposing spring assembly (comprising springs 22, 24, and 27 and separator pad 26) improve the separating function of the stripper mechanism to compensate for the varying forces initially exerted on the paper stack 14 when the user inserts the stack 14 into machine 10.
  • Fig. 3 is a perspective view of the preferred embodiment stripper roller 20.
  • Stripper roller 20 includes eccentric kicker portions 40 and 42 located at the ends of the cylindrical middle portion 44 (also identified in Fig. 2).
  • Stripper roller 20 is forcedly slipped over a stainless steel shaft 46 and is frictionally secured to shaft 46.
  • Shaft 46 includes a flattened end 48 which is ultimately secured to a suitable slip clutch and gear mechanism within facsimile machine 10 for rotating stripper roller 20.
  • a molded plastic shim 50 is attached to shaft 46 and includes an extension which is inserted under kicker portion 40 to create the eccentricity of kicker portion 40.
  • An identical shim 51 (shown in Fig. 4) is used to create the eccentricity of kicker portion 42.
  • stripper roller 20 The preferred embodiment dimensions of stripper roller 20 are identified with respect to Fig. 4 and are as follows: The width A of middle portion 44 is approximately 29 mm; the diameter B of middle portion 44 is approximately 19 mm; the width C of each kicker portion 40 and 42 is approximately 8 mm; the distance D, measuring the eccentricity of kicker portions 40 and 42, is approximately 1.5 mm; and the length of shaft 46 is approximately 27.5 cm.
  • the value of D may range from anywhere between 1.0 mm to 2.5 mm while still achieving the improved paper separation results described below. As D exceeds 2.5 mm, the downward spring pressure exhibited by paper-feed springs 22 and 24 in Fig. 2 on kicker portions 40 and 42 becomes too great, and the restraining force of separator pad 26 may be insufficient to stop two or more paper sheets from being simultaneously forwarded downstream by roller 20.
  • the dimensions A-C may, of course, be larger or smaller depending upon a particular application.
  • the radius of the middle portion 44 and the maximum radius of kicker portions 40 and 42 may range from 5 mm to 30 mm.
  • the dimension D may also be increased. Experimentation may be used to obtain the optimum value of D.
  • Figs. 5 and 6 illustrate in more detail the spring assembly 52, comprising paper-feed springs 22 and 24 and separator spring 27.
  • Spring assembly 52 is stamped from a single piece of sheet steel and formed using conventional fabrication methods.
  • Spring assembly 52 is secured to the metal frame 53 (only a portion of frame 53 is shown) in the top portion 17 (shown in Fig. 2) of machine 10 using screws 54 and 55.
  • Screws 54 and 55 also secure separator pad 26 to spring assembly 52 but do not squeeze the rubber separator pad 26.
  • optimum separator characteristics of separator pad 26 are maintained despite the varying torque placed on screws 54 and 55 to secure assembly 52 to frame 53.
  • screws 54 and 55 having a sleeve portion 56 which extends through holes 58 in separator pad 26 and which directly contacts the metal spring assembly 52. Holes 59 in the metal spring assembly are smaller than holes 58. Thus, resistance to further turning of screws 54 and 55 is due to sleeves 56 opposing spring assembly 52 and not due to the heads of screws 54 and 55 opposing rubber separator pad 26.
  • Spring assembly 52 itself has other advantages. By using an integral structure, spring assembly 52 is easy to handle, and springs 22, 24, and 27 are pre-aligned. Further, the spring characteristics of paper-feed springs 22 and 24 can be made independent of the spring characteristics of separator spring 27 since the lengths and widths of springs 22, 24, and 27 are independently selectable. The spring assembly 52 is also extremely compact since paper-feed springs 22 and 24 extend the entire length of spring assembly 52.
  • Fig. 7 is an elevated side view of stripper roller 20 in Fig. 2 when top portion 17 is in its closed position shown in Fig. 1.
  • the eccentric kicker portion 40 is shown in solid outline, with the obscured cylindrical middle portion 44 shown in dashed lines. Shaft 46 and shim 50 are also shown.
  • Paper-feed spring 24 opposes the surface of kicker portion 40, while rubber separator pad 26 opposes the cylindrical middle portion 44 with a downward pressure exerted by separator spring 27.
  • Spring assembly 52 is attached to frame 53 using screws 54 and 55 as described with respect to Fig. 6.
  • F S 1 exerted by spring 24 on kicker portion 40. This force may be on the order of 31 grams ⁇ 6 grams.
  • the downward spring force by separator spring 27 urging separator pad 26 against the cylindrical middle portion 44 is approximately 183 grams.
  • F S 2 exhibits a downward force of approximately 10 grams greater than F S 1.
  • F S 1 and F S 2 the various forces exerted by paper-feed spring 24 on the paper sheets will of course exceed F S 1 and F S 2, but the difference between F S 1 and F S 2 will remain relatively the same.
  • Fig. 9 illustrates the force F S exerted by paper-feed spring 24 or 22 against the eccentric kicker portion 40 or 42 as stripper roller 20 rotates.
  • the apex 60 (Fig. 8) directly opposes paper-feed springs 22 and 24.
  • the paper feed springs and the separator spring need not be leaf springs but may be any resilient means providing an opposing force against kicker portions 40 and 42 or middle portion 44.
  • Figs. 10 and 11 illustrate the operation of the eccentric kicker portions 40 and 42 as the apex 60 makes a first revolution after a paper stack 14 is inserted into the facsimile machine 10.
  • a user inserts a paper stack 14 in the direction shown by arrow 61 between paper-feed springs 22/24 and kicker portions 40/42 of roller 20.
  • the user senses the resistance to further insertion of the paper stack 14 and releases the paper stack 14.
  • the actual extent to which the paper stack 14 is inserted between roller 20 and paper-feed springs 22/24 thus varies depending upon the user.
  • the downward force applied by paper-feed springs 22/24 is thus increased (causing the friction between the kicker portions 40/42 and the bottom paper sheet to be increased).
  • the apex 60 of kicker portions 40/42 effectively reaches out to contact a greater bottom surface area of the bottom paper sheet so that the bottom sheet is pulled forward by the direct frictional contact with the kicker portions 40/42, while the other sheets are pulled forward with less force by their friction with this bottom sheet.
  • the downward angle of paper-feed springs 22/24 causes the paper stack 14 to spread forward to resemble a staircase (Fig. 11), while the bottom sheet or bottom few sheets continue to be carried forward by the high friction between the kicker portions 40/42 and the bottom sheet.
  • Fig. 11 illustrates the position of stack 14 after being carried forward during the first rotation of stripper roller 20 at the point where apex 60 has now completed its function and advanced the bottom sheet 64 or bottom few sheets to be in contact with the rubber separator pad 26.
  • the friction between the bottom sheet 64 and the rotating roller 20 continues to push the bottom sheet 64 out from under separator pad 26, while the sheets overlying this bottom sheet 64 are held back by contact with separator pad 26 and slip with respect to the bottom sheet 64.
  • the main feed roller 30 controls the forwarding of the bottom sheet, as previously described with respect to Fig. 2.
  • Kicker portions 40 and 42 also create the advantage of allowing paper-feed springs 22 and 24 to have a low spring constant relative to that of the separator spring 27, since the momentarily high paper feeding force is brought about by the eccentricity of kicker portions 40 and 42 rather than by a high spring constant of springs 22 and 24. This is advantageous because a reduced downward pressure by the paper-feed springs 20 and 24 decreases the likelihood that multiple sheets will be forced across separator pad 26.
  • Figs. 12-15 illustrate a cost-effective way to manufacture the roller 20 and shaft 46 assembly.
  • an end 48 of stainless steel shaft 46 is ground to have a flat portion for enabling turning of shaft 46 and stripper roller 20 by the previously described gear mechanism and slip clutch assembly when installed in the facsimile machine 10.
  • Notches 68 are also formed in shaft 46 using a grinding or broaching step. These notches 68 are for securing and aligning plastic shims 50 and 51 in place as shown in Fig. 15.
  • Rubber stripper roller 20 is initially formed, using injection molding, to be cylindrical as shown in Fig. 13.
  • Shaft 46 is forcedly inserted through a central hole of roller 20 so that notches 68 are on either side of roller 20.
  • Shaft 46 is then rotated on a lathe, and a counter-rotating abrasive grinding tool 70 is then moved across the width of the rotating roller 20 to cause roller 20 to have the desired diameter. This grinding also serves to slightly roughen the surface of roller 20 for increased friction with the paper surface.
  • the roller 20 and shaft 46 assembly is then removed from the lathe and placed in a fixture 76 having V-shaped supports for contacting kicker portions 40 and 42.
  • a force F is then downwardly applied to both ends of shaft 46 to displace the kicker portions 40 and 42 upward with respect to shaft 46. This causes a gap 78 between shaft 46 and kicker portions 40 and 42 into which shims 50 and 51 are inserted.
  • the U-shaped end portions of shims 50 and 51 slide over notches 68.
  • shims 50 and 51 are held in place by notches 68 and the downward pressure of kicker portions 40 and 42 on the shims.
  • shims 50 and 51 create a 1.5 mm asymmetry in kicker portions 40 and 42.
  • the kicker portions 40 and 42 are now identical in all respects and, as a result, no skewing of the paper occurs.
  • the resulting stripper roller 20 and shaft 46 assembly (shown in Fig. 3) can be formed to any dimension to directly replace existing stripper roller assemblies using a single cylindrical roller.
  • asymmetrical kicker portions 40 and 42 may be molded separately from middle portion 44.
  • shaft 46 may be machined to include raised portions corresponding to where shims 50 and 51 in Fig. 15 are positioned.
  • shims 50 and 51 may be deleted.
  • the various dimensions of each of the portions of the stripper roller may be adjusted as necessary for a particular application.

Landscapes

  • Sheets, Magazines, And Separation Thereof (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Facsimiles In General (AREA)
EP95109832A 1994-10-14 1995-06-23 Système de prélèvement et séparation des feuilles pour appareil fac-similé et machine à copier Expired - Lifetime EP0706894B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US324288 1994-10-14
US08/324,288 US5537227A (en) 1994-10-14 1994-10-14 Paper picking and separator system for facsmile or copy machine

Publications (3)

Publication Number Publication Date
EP0706894A2 true EP0706894A2 (fr) 1996-04-17
EP0706894A3 EP0706894A3 (fr) 1998-02-18
EP0706894B1 EP0706894B1 (fr) 1999-11-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95109832A Expired - Lifetime EP0706894B1 (fr) 1994-10-14 1995-06-23 Système de prélèvement et séparation des feuilles pour appareil fac-similé et machine à copier

Country Status (4)

Country Link
US (1) US5537227A (fr)
EP (1) EP0706894B1 (fr)
JP (1) JPH08188273A (fr)
DE (1) DE69513127T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0707972A3 (fr) * 1994-10-17 1998-03-04 Hewlett-Packard Company Châssis intégré dans une unité de balayage pour l'alimentation automatique de documents

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JP3556038B2 (ja) * 1996-01-22 2004-08-18 ニスカ株式会社 給紙装置
US6086062A (en) * 1996-12-25 2000-07-11 Minolta Co., Ltd. Sheet feeder unit
JP3403073B2 (ja) * 1997-08-26 2003-05-06 キヤノン株式会社 シート給送装置及び画像処理装置
US6371478B1 (en) 2000-04-18 2002-04-16 Hewlett-Packard Company Adaptive apparatus for improving media separation
JP2004099295A (ja) * 2002-09-12 2004-04-02 Sharp Corp 給紙装置
US7513495B2 (en) * 2005-12-13 2009-04-07 Hewlett-Packard Development Company, L.P. Separator
US7852526B2 (en) * 2006-04-28 2010-12-14 Hewlett-Packard Development Company, L.P. Separator
JP5699946B2 (ja) * 2012-01-18 2015-04-15 ブラザー工業株式会社 シート送り装置
JP5962075B2 (ja) * 2012-03-05 2016-08-03 ブラザー工業株式会社 シート搬送装置

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US4887806A (en) 1987-02-23 1989-12-19 Sharp Kabushiki Kaisha Paper transport system for apparatus including facsmile and photocopying machines

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US4887806A (en) 1987-02-23 1989-12-19 Sharp Kabushiki Kaisha Paper transport system for apparatus including facsmile and photocopying machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0707972A3 (fr) * 1994-10-17 1998-03-04 Hewlett-Packard Company Châssis intégré dans une unité de balayage pour l'alimentation automatique de documents

Also Published As

Publication number Publication date
EP0706894A3 (fr) 1998-02-18
JPH08188273A (ja) 1996-07-23
DE69513127D1 (de) 1999-12-09
US5537227A (en) 1996-07-16
EP0706894B1 (fr) 1999-11-03
DE69513127T2 (de) 2000-06-15

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